The survivors of Planet Baam and the Earth people want to sign a peace treaty, so General Lion and the renowned scientist Dr. Ryūzaki head out to have a reunion. But Lion dies in odd circumstances, his vengeful son Richter kills Dr. Ryūzaki—and war starts. Dr. Ryūzaki's son, young martial artist Kazuya, decides to defend Earth with Dr. Izumi's powerful robot: Tōshō Daimos...

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